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The tool tip for a browser tab exposes information such as the process ids (on Nightly) and the container tab name. It appears when a user mouses over the tab, but this isn't really accessible to screen reader users. Ideally, we'd expose this information as the accessible description for all browser tabs. However, doing this for all tabs and keeping it up to date is rather difficult and potentially expensive. Instead, just expose this description for a tab when it gets focus; i.e. the user has to focus the tab bar to access it. To enable this, XUL tab elements now fire an AriaFocus event on the ARIA focused tab when the ariaFocusedItem property is set. Differential Revision: https://phabricator.services.mozilla.com/D38027 --HG-- extra : moz-landing-system : lando |
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